Method try_to_bool

crates/vm/src/builtins/bool.rs:37–66

Convert Python bool into Rust bool.

(self, vm: &VirtualMachine)

impl PyObjectRef {
    /// Convert Python bool into Rust bool.
    pub fn try_to_bool(self, vm: &VirtualMachine) -> PyResult<bool> {
        if self.is(&vm.ctx.true_value) {
            return Ok(true);
        }
        if self.is(&vm.ctx.false_value) {
            return Ok(false);
        }

        let slots = &self.class().slots;

        // 1. Try nb_bool slot first
        if let Some(nb_bool) = slots.as_number.boolean.load() {
            return nb_bool(self.as_object().number(), vm);
        }

        // 2. Try mp_length slot (mapping protocol)
        if let Some(mp_length) = slots.as_mapping.length.load() {
            let len = mp_length(self.as_object().mapping_unchecked(), vm)?;
            return Ok(len != 0);
        }

        // 3. Try sq_length slot (sequence protocol)
        if let Some(sq_length) = slots.as_sequence.length.load() {
            let len = sq_length(self.as_object().sequence_unchecked(), vm)?;
            return Ok(len != 0);
        }

        // 4. Default: objects without __bool__ or __len__ are truthy
        Ok(true)
    }
}

#[pyclass(name = "bool", module = false, base = PyInt, ctx = "bool_type")]